Yang Tong, Tian Liangliang, Zhou Enmin, Chen Daidong, Lei Yu
School of Materials and Energy, Southwest University, Chongqing, People's Republic of China.
Chongqing Key Laboratory of Materials Surface and Interface Science, Chongqing, People's Republic of China.
Nanoscale Res Lett. 2020 Feb 18;15(1):44. doi: 10.1186/s11671-020-3278-2.
Although transition metal sulfides have presented prospect in electrochemical sensing, their electrocatalytic performance still cannot meet the demands for practical applications due to the difficulties in mass transport and electron transfer. In this work, double-shelled CuS nanocages (2-CuS NCs) were prepared for enzyme-free ascorbic (AA) sensor through a CuO- templated method. The unique double-shelled hollow structure displayed large specific surface areas, ordered diffusion channels, increased volume occupying rate, and accelerated electron transfer rate, resulting in enhanced electrochemical dynamic. As a sensing electrode for AA, 2-CuS NCs modified glassy carbon electrode (2-CuS NCs/GCE) exhibited eminent electrocatalytic activity in terms of satisfying sensitivity (523.7 μA mM cm), short response time (0.31 s), and low limit of detection (LOD, 0.15 μM). 2-CuS NCs look promising for analytical sensing of AA in electrochemical sensors thanks to its prominent electrocatalytic kinetics issued from double-shelled hollow porous structure.
尽管过渡金属硫化物在电化学传感方面展现出了前景，但由于传质和电子转移困难，其电催化性能仍无法满足实际应用的需求。在这项工作中，通过氧化铜模板法制备了用于无酶抗坏血酸（AA）传感器的双层硫化铜纳米笼（2-CuS NCs）。独特的双层中空结构具有大的比表面积、有序的扩散通道、增加的体积占有率和加速的电子转移速率，从而增强了电化学动力学。作为AA的传感电极，2-CuS NCs修饰玻碳电极（2-CuS NCs/GCE）在灵敏度（523.7 μA mM cm）、响应时间短（0.31 s）和检测限低（LOD，0.15 μM）方面表现出卓越的电催化活性。由于其双层中空多孔结构产生的突出电催化动力学，2-CuS NCs在电化学传感器中对AA的分析传感具有广阔前景。
